Features:Overload alarm function (over power alarm threshold, backlight and power flashing to alarm).Power alarm threshold preset function (can set power alarm threshold).The energy can be reset use the key.Store data when power off.Large-screen LCDBacklight function.Specification:Brand:PEACEFAIRModel: PZEM-022 Current:100ARated power:100A/22000WOperating frequency: 45-65HzMeasurement accuracy: 1.0 gradeSize: 9*5*2.5cm/3.5*2*1inWire length:19cm/7.5inWeight: Approx.110g/3.9ozAppearance and Key function:I.Display InterfaceDisplay interface is large-screen LCD, it can display six parameters at the same time.II.Display format1. Power: test range: 0~22000W, Starting measure power:0.5W10W display format:1.00~9.99W100W display format:10.0~99.9W1000W display format:100~999W10000W display format:1.00~9.90kW10000W display format: 10.0~22.0kW2. Energy: test range: 0~999kWh1kWh display format:0~999Wh10kWh display format:1.00~9.99kWh10kWh display format: 10~999kWhDisplay format: 80~260V4. Current: test range: 0~100A,Starting measure current: 0.002A10A display format:0.000~9.000A10A display format:10.00~99.99A5. Frequency: test range: 45~65Hz Display format: 45~65Hz6. Power factor: test range: 0~1PF Display format: 0.00~1.00PFKey function:1. Backlight controlShort press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when power off.2. Reset energyStep1: Long press the key for 5 seconds until the energy value flash, then release the key.Step2: Short press the key again, then the energy value is cleared and exit the reset flashing state.Step3:If there is no operation on the key within 5 seconds, it means the energy value is not cleared and will exit the reset state.3. Set power alarm thresholdStep1: Long press the key until the LCD screen display"SET CLr", then release the key to enter the setting stateStep2: Power window display the current power alarm value and the last digit begin to flash, then you can short press to plus 1, when there is no operating over 3 seconds, it will switch the digit position automatically, the setting method is as same as the above.Step3: After finish the setting, long press the key over 5 seconds will store automatically and exit, the range of active power threshold is 0.0~2.5kW.Package list:1 x AC Multifunction Digital Meter1 x Closed Type CT Note:1. This module is suitable for indoor, please do not use outdoor.2. Applied load should not exceed the rated power.3. Wiring order can't be wrong..